Hi Ralph:
	Solder mask blister is a bubble of the solder mask created by
gas entrapped by the solder mask that creates a deformation by the
release or expansion of the gas. Check IPC-A-610D 10.5.1.2 Solder Resist
Coating - Voids and Blisters. There are pics that show blisters of
Solder Mask. 
	Regards,
	Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ralph Richart
Sent: Monday, March 19, 2007 11:58 AM
To: [log in to unmask]
Subject: [TN] Soldermask Blisters

IPC A-600, section 2.9.4 refers to Blisters/Delamination in Soldermask.

I am looking for clarification as to what these actually are?  How do
they manifest themselves?  I can't say I've ever seen one, so I am
trying to know what one would look like if I hade seen one.

thanks

Ralph

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